mcs/class/referencesource/System.Activities.Presentation/Microsoft.Tools.Common/Microsoft/Activities/Presentation/Xaml/ResolverCache.cs

   1 //----------------------------------------------------------------
   2 // <copyright company="Microsoft Corporation">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //----------------------------------------------------------------
   6
   7 namespace Microsoft.Activities.Presentation.Xaml
   8 {
   9     using System;
  10     using System.Collections.Generic;
  11
  12     internal class ResolverCache
  13     {
  14         private Dictionary<Type, WeakReference> cache;
  15
  16         public ResolverCache()
  17         {
  18             this.cache = new Dictionary<Type, WeakReference>();
  19         }
  20
  21         public void Update(Type type, ResolverResult result)
  22         {
  23             SharedFx.Assert(type != null, "type should not be null");
  24             SharedFx.Assert(result != null, "result should not be null");
  25
  26             if (this.cache.ContainsKey(type))
  27             {
  28                 this.cache[type] = new WeakReference(result);
  29             }
  30             else
  31             {
  32                 this.cache.Add(type, new WeakReference(result));
  33             }
  34         }
  35
  36         public ResolverResult Lookup(Type type)
  37         {
  38             SharedFx.Assert(type != null, "type should not be null");
  39
  40             WeakReference value;
  41             if (this.cache.TryGetValue(type, out value))
  42             {
  43                 return value.Target as ResolverResult;
  44             }
  45
  46             return null;
  47         }
  48     }
  49 }